Go ahead, make my day.
Automatically runs make when its prerequisites change (or, become "dirty").
Pretend you're running make, but type harry instead. It will do an initial
build if necessary, and continuously watch for changes in the files and
directories described by the specified target (plus the Makefile itself).
All arguments are forwarded along to make, so if you want to continuously run
a particular target, just do harry TARGET. Same goes for forwarding
parameters (harry FOO=1).
Do you feel lucky, punk?
Filesystem-watching interfaces are notoriously inconsistent across platforms.
Harry should at least compile on your platform, but it may not work very well.
For example, on Darwin it has to resort to watching a ton of files, and you may
hit a resource limit. If this happens you can increase the limit with ulimit -n 65535.
Linux should work fine. No idea about Windows.
Just make. Runs make -dnr to figure out your prerequisites, and uses
fsnotify to watch for changes. This makes harry super portable.